Process of producing three-color screens.



R. KRAYN. PROCESS 0F PRODUUING THREBG0L0R SCREENS.

APPLICATION FILED NOV. 17, 1909.

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Patented Mar. 4, 1913.

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Wille it known that lQRomm'r lilmYN, a "subject, ot' "the German lhnpcror` and resi- 'dent ofV Berlin.(icrmanyhave invented cer- .UNUED STATES PATENT OFFICE.,

ROERT KRAYN. 0F 'BERLIN'. GERMANY,l ASSIGNOR T0 THEv FIRM OF DEUTSCHE GERMANY.'

tain new anduset'nl Improvements in Processes for Producing 'l`li1t,\tt`olor Screens` of which' the following is a specification.

`This in\'ention is based on the discoveiy. in the chemistry ol colloids. that colored 'gelatin may be immunized against a great number ol solutions ot' coloring matters b v treating the colored gelatin with a tanning agent that is also a mordant for the coloring'l matter. Thus.,l t'or instance. l'erric chlorid is both a mordant lor cinnabm' Scarlet l (i tot Lthe 1 Leipzig A\ni|inel"ac tory Beyer Kegali). and also a tanning i agent for gelatin. it. therefore a gelatined glass plate,`or Celluloid lilm. is colored with asolution of such cinnaharfscarlet, and then dipped into a ten per cent. solution ot' ferrie chloric.then washed. and the plate or ihn allowed to dry; the resultant red colored gelatin surface ot the plate may be subjected to various green and blue solutions of coloring matter' without being a'rlt'eet'ed thereby.

If the red 4coloredlgelatiii-surface were treated in a solution, for instancebarium chlorid, which-'is only `a mordant for the coloring-n'iatter `without being`alsoa ltanning material for gelatin; it Awould beat'- fected hy solutif'is et' other colors.,` 'lhe Same would be t 1e 'fcase if there was added tothe solution of cinnab'ar-scarlet a tanning agent.'for" gelatin, for instance forma n, which is not a mordant for the coloring matter. Or ifthe red colored gelatin is subsequent-ly treated withy such`a tanning material an overcoloring ot' the red gelatin would occur if it is subjected into a sollition of a green or blue coloring matter.

The described treatn'ient.-with an agent which will both tan the gelatin. and mordant the color,l does not make the colored gelatin immune against allother solutions of coloringv matter; but the gelatin, the coloring` matter and the tanning-mordant. form a chemical complex which will resist those Solutions of coloring matter which have no affinity for such chemical complex. The coloringimatters possessing such quali ties are selected empirically.

Specification of Letters Patent. Alipn'catipn med November 1,7. 1909. serial No, 528,615.

RASTER-GESELLSCHAFT MIT' BESCHRNKTER HFTUNG. OF BERLIN-STEGLITZ,

lROCESS OF PRODUCING 1THREE-COLOR SCREENS.

Patented Mar. 4. 1913.

The resistance of the colored gelatin, which has been treated according to the present invention, to other solutions ot' coloring matter ift-orrectly selected, occms with such promptnessl and reliability that it may be due to electrostatic processes: and it may be that th'c colored gelatin spots receive a unit'orni electric charge during the process oll .simultaneous mordanting and tanning. and consequently that they oll'er resistance to all coloring matters carrying a similar electric charge. However that may be the novel ellcct is realized and the hereina'lter described process for the production ot` lscreens otVsereral colors is based on this observation.

l The novel process consists in covering the spots or portions ol a gclatined surface. (itor instance a gelatined glass plate or tilm.) which are not to talte the lirst color, (for instance red), with a suitable t'atty color. 'lhis t'atty color may be readily applied, for instance by means ol a printing` surface corresponding in extent to the4 gelatined surlace. Thereupon the thin printed gelatin surlace is dipped into the first. (for instance, red) solution. (saY a solution ot' cinnabar-scarlet-(l) which will color red only those portions ot' the `gelatin surface which are not protected by the fatty color. After t-he exposed partsl ol the gelatin surtace have. assumed the required intensity 'of color, thc-plate is dipped into` a solution of 'ferrie chlorid vand the `excess l of color washed otl: the plate is then dried and finally the 'l fatty color is washed ofi".y with turpentine or the like. As a result ot' `this treatment, the gelatined surface notl `the l l)late is now covered with red siots. lines able tor producing a blue ground colon-is.

methyl-blue forsilk M. l. L. `B. (of the Huchster 'Colour VOrkS). The saidred tin.

spotted gelatined surface may now be again printed with fatty color to cover those portions or spots of the still uncolored gelatin surface, which are not to tialte any blue color; and such printed plate is then dipped into a solution of the blue coloringmatter. For the said blue coloring matter ferrie chlorid.. is a mordant. In such blue color bath the portions ot' the gelatin surface which are not red and which arenot covered by the fatty color become blue. while the other parts remain unchanged. The plate is then again dipped into a solution of ferric chloridn washed; dried and then the second fatty color is also washed off. 4lf the two fatty color prints consisted, forinstance7 of two systems of lines crossing each other, the gelatin surface would now be found covered with red lines, between which there are blue rectangles. while the remaining spaces are still uncolored.

For the third or green coloring a solution of a coloring matter which is repulsed by cinnabar-scarlet, ferrie chlorid, gelatin; as well as by methyl-blue ferrie chlorid gelatin should be selected. It is not absolutely necessary that this third coloringmatter be fixed or immunized on thegelatin, as a further treatment of the plate in coloring solutions is not desired. But itis desirable that the green elements be also treated in the same manner as the first two colors. A spectroscopicallv correct green coloring mat'- ter. which answers the above conditions. can be '.ibtained for example by dissolving a mixture of patent blue A 1n yellow .E (both of the l--luchster tolor Yorks 'For such green coloring matter ferrie chlorid, also acetate of'aluminium, is a Inordant. By subjecting the plate to a solution of the green coloring matter, the uncolored gelatin spots are colored green, while the parts of the plate colored by the first and second steps, are unchanged. By subsequently treating the plate with ferrie chlorid the green color is fixed on the gela- The three color plate or screen after drying may then be varnished.

ln the accompanying drawings I have illust ated diag ammaticallyvthe process of producing Isuch a three color screen or plate.

Figure 1 is a View of the screen plate showing the first steps of the process. Fig. 2 is a similar view showing the second step ot' the process. Fig. 3 is a View of the complete screen plate.

Referring to Fig. l, a indicates parts of the gelatined surface of the plate which have been printed with fatty ink; b indicates the' parts which'have been colored by dipping such printed plate in the first, for instance (red) solution. y

ln Fig'. 2, a indicates the portions of such plate printed with fatty ink so as to remain tamales free from'the second color, and when the plate is dipped into the second coloring solution. say blue, the parts. indicated at c, not protected by the fatty ink and the previous color, will be colored blue; and when the fatty inlt is washed ott and the plate dipped into a third color solution, say green, the partsI indicated at in Fig. 3, (and at u in Fig. 2) will be colored green.

'lhe strength of the color solution may be varied; for examples merely I mention the following; but do not limit myself to the conrbimitions or proportions stated. The red. or tirst color solution. may be composed of: g. cinnabar-scarletG, 1000 c. c.` water, and 50 c. c. concentrated acetic acid. The green, or second color solution, may be composed of: 10 methanyl yellow, l0 g. pat.- ent blue, 1000 c. c, water. The third or bille color solution may be composed of: an aqueous solution of methyl-blue.

'hat I clailn is: 'y

.1. The herein described process of making color screens, consisting in successively protecting or covering parts of a gelatin 'surface with a coatingimpervious to c0101' and mordant and whichcan be removed, and then coloring the parts not protected or previously colored; the gelatin after each coloring being treated with an agent which acts as a mordant for the applied coloring matter and also as a tanning means for the gelatin.

2. The process of producing color screens. consisting in coating with a fattr substancewhich can be washed ott'. those parts of a gelatined surface which are to remain untouched by the ground color used, said fatty substance being impervious to color and mordant; then coloring the open interspaces of the coated gelatin surface with the ground color, then Atreating the colored spots with an agent which acts as a mordant for the applied coloring matter and also as a tanning means for the gelatin; then drying the screens and removing the fatty substance. substantially as set forth.

3. The process of producing three color screens, consisting in coating with a fatty substance which can be washed oft', those parts of a gelatinedsurface which areto remain untouched by the lirst `ground color used, said fatty substance Ybeing impervious to color and mordant; then coloring the open interspaces of the coated gelatined surface in the first ground color, and treating the colored spots with an agent which acts as a virdant and also as a tanning material -for gelatin; then dryingthe screens and washing the fatty substance olf; then applying a second coat of fatty substance to the uncolored parts of the gelatin surface which are to remain untouched by the sec'- ond ground color, then coloring the open 'secon ground co'10r,rthen treating `with such a tanning and mordant-mg agent; Athen 'removing with the' name to this specification in the presence of the same `two subscribing witnesses.

ROBERT KRAYN.

ntrs` apes ofl` the gelatin snurface the fatty substance; :pldf nally applying n third ground color, substanttally as setforth.

`In testimony ,whereof `I have signed my Witnesses H'xmmr- HASPER, NVOLDEMAR HAUPT.

Coplas of'fthis patent may be obtained for ive cents each, by addressing the "Commissioner of Patents,

` Washington, D. C. 

